Coating compound



Nov. 18, 1930.

s. cHARLEswoRTH ET AL 1,782,341

COATING COMPOUND Filed Feb. 4, 192W AL l l l EEFL ux (avan/55e Cavan/ste MC2/wv PUMP Petented Nev. 1, 1930 UNITED STATES STANTON I'CHARLESWORTH AND ARCH WfH-ARBIS, OF CLEVELAND, OHIO COATIN G COMPOUND Application mea rebruarya, 1927. seriall No.'1e5,s7o.'

This invention relates to coating compounds and more particularly to coating compounds suitable for coating nails and other metal objects.

5 One object of this invention is to provide a valuable and commercialL coating. compound, the principal ingredient of which 1s recovered from the heretofore waste product known aspure still residue, remaining after the distillation of the light oils recovered yfrom by-product coke oven gas.v f

Another object is to provide a novel method of manufacturing coating compounds from the heretofore waste pure still residue. In the drawings we have shown a planof the apparatus used in 'carrying out our 111-' vention. t

In the manufacture of by-product coke or other destructive distillation of coal the gases and products of combustion are collected in suitable mains or conduits so that they may `be passed through successive processes to recover the byroducts therefrom. The specific steps o the various processes diHer slightly, but are well-known to those skilled in the art.

The gases after leaving the ovens are first treated to extract the ammoniaand tar contents therefrom. The gases are then scrubbed with suitable wash oils to absorb the light oilsv which are a combination of benzol, toluol, d and Xylenes. e

The wash oils with their content of absorbed light oils (known as benzolized wash oil) are then run through the primary stills to. sparate the light oils from the wash oils,

`after which the wash oils are returned to again be used in scrubbing other gases. The separated light oils are then again distilled ing from the 'crude stills are washed with sulfuric acid to removefimpu'rities such as plelines, phenols, and sulfur compounds.

50 After the light oils are washed with the oil.

in what is known as a crude still to separate vafter distilling the light oils consists of a resinous product composed of resinous polymers resulting from the washing of the light oils with the sulfuric acid, together with some This residue has been heretofore considered a Waste product.

In accordance with this invention, the residue from the pure stills is collected and "charged into a still equipped to distill under a vacuum. The still is then heated to a temperature up to 225' to 300 degrees centigrade under a vacuum of approximately 28 inches of mercury, until-the residue has a melting point of 105 to 110 degrees centigrade, and the distillate, which is an intermediate prodover from the still into a condenser and collected, forming a commercially usable and salable oil.l i The residueremaining in the still is a resinous product which is run into a cooling tank and mixed, while molten and hot, with a solvent such as benzol or other light oil products, and made Huid so as to be usable as a coating compound.

Referring particularly to the drawings, the letter A designates a tank car or other contalner constituting thel source of supply of the pure still residue which has been formed as set forth in the forepart of this specication. The pure still residue is pumped through a conduit or pipe 2 and discharged into a lstill 3, which may be of any well-known design, but is preferably of the indirectly heated type and suiciently tight to permit the forming of a vacuum therein. A Vacuum pump 4 is connected to a vacuum tank 5 by a pipe 6,

which in turn is connected with a condenser 9 by a pipe 7, and the condenser 9 isconnected to the top of the still 3 by a pipe 10 so as to receive the distillate from the still, which uct of polymerization, is permitted to run distillate is condensed and collected-inI the condenser and is a finished oil productfhe distillate is anfoil consisting of the intermediate product of polymerization and has a o low solidifying point so as to be usable in very loW temperatures, and also this oil has a base gravity approximately equal to Water so as any ofit' through the refluxcondenser. The' finished material should have a viscosit to be ideally usable for lubricating purposes, as a substitute for Water in gages, and for the carbureting of Water gas.

The still 3 is preferably heated to such al temperature as will give the proper melting point to the residue, but not materially above such point since too high a heat Will destroyl the resinous residue remaining after the distillation of the above oil. The vacuum pump 4 serves to produce a vacuum of approximately 28 inches of mercury in the'still 3'and,"

therefore, permits the use of the low distillin temperature stated above.

The resinous residue remaining in the still 3 after the distilling ofi:l of the oil is -thenl run, `While hot, from the still 3 through va pipe 12 into a coolin and mixing tank 13,. The

- tank 13 is provi ed with a mixing paddle 14 for mixing the residue with 'a quick drying solvent such as motor benzol, which enters the tank 13y through a pipe 15 from a supply.

vapors from the mixing tankdeparting from the scope of our invention as vdefined in the appendedJ claims.

We claim- 1. A coating compound adaptedto form a` the residue remaining afterthe distilling,l

up tio 300 degrees centigrade under approximately 28 inches of vacuum, of the pure still residue remaining after the distillation of the light oils recovered from by-product coke oven'gas, said resin base being mixed while molten and hot with approximately 30 per cent. by Weight of benzol orcther light oil products.

2. The method of making a coating compound, which consists in distilling a resinous compound composed of resinous polymers and oils `remaining after the distillation of the light oils recovered from by-product coke oven gas ata temperature of 'from 225 to 300 degrees centigrade and under a vacuum of approximately 28 inches of mercury, until the residue has a melting point of 105 to 110 degrees centigrade, separating the distillate from said compound, then mixing the molten and hot residue with approximately 30 per cent. by weight of benzol to form a fluid coating material having a resinous base.

In testimony whereof, we have hereunto signed our names. Y .y

STANTON I. CHARLESWORTH.

Anon W. HARRIS.

motor benzol or other light oilproducts under the reflux condenser 17, which benzol is added gradually from the supply tank 16 and the mass is stirred-` continuously so as not to lose of approximately 78 degrees as determined y a l Doolittle viscosimeter at 104 degrees' Fahrenheit, and may then be thinned down by the addition of benzol to any desired viscosity.

Material made as described, forms a var-l nish-like coating that, While especially adapted for coating nails soas to resist any pulling I 5 action which would'tend to withdraw the 60 steps of our method for producing nailsfrom the wood into which they have been driven, may also be used for coating other materials..

While we have described certain specific is novel coating material, it will be understood that we .do not Wish to be limited thereto since various changes in proportions, temperatures and sequence of steps may be made without' ins` 

